X access control

Hello
How can I enable applications from localhost to be run on user's display.
I have to execute "xhost +localhost" everytime I start a user's session.
I put the following into user's ~/.bash_profile:
export DISPLAY=:0.0
[ "$DISPLAY" != "" ] && xhost +
but it takes long time to log on whne X server is not running.
Is there any system wide file of where I can disable access control for localhost.
If not how can I configure it correctly ?
thank You for help
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